Improve error reporting for pdnssec
Fix zone into cmds[1] in few places
Merge pull request #1029 from cmouse/improve-pdnssec-errors

Improve error reporting for pdnssec
Merge pull request #1030 from stbuehler/libtool-object-files

modules: use libtool object files - real object file might be in a .libs subdir
fix presigned negated check
white space cleanup in [db]dnsseckeeper.{hh,cc}
use zname for zone name in [db]dnsseckeeper.{hh,cc}
fix DNSSECKeeper::isSecuredZone: use same check in cache hit and cache miss paths
DNSSECKeeper: separate retrieving (filtered) key list from updating cache; set d_isSecure flag while updating cache and use it
support zones with offline KSK (DNSKEYs presigned) (fixes #481)